Improvement in machines for making metal screws



5 SheetsSheet 1. L. W. STOOKWELL. Machine for Making Metal Screws. No. 200,155. Patented Feb. 12,1878.

Jfim, & w. SM W W N.FETERS. PHOTO-UTHOGRAPHER. WASHINGTON. D. C.

5 Sheets-Sheet 2. L. W. STOOKWELL. Ma0hine for Making Metal Screws. No. 200,155.

,Patented'Feb. I2, 1878.

. 5 Sheets-Sheet 3 L. W. STOOKWELL. Maohinefor MakingMetal Screws. Y No. 200,155. E7i 1Z ented Feb. 12,1878.

5 Sheets-Sheet 4. L. W STOGKWELL.

Machine for Making Metal Screws. NET 200,155. Patented Feb. 12, I878.

QQS W MM SW 1 \h ss 'wmmk W ItFETERS, PNGTO-UTNDGRAPHER. WASEHRGTUN' D C.

5 Sheets-Sheet 5.

L. W. STOOKWELL. Machine for Making Metal Screws.

-No. 200,155 Patented Feb. 12,1878.

N.FETERS. PHQTO-UTHOGRAPHER, WASHINGTON. D cv UNITED STATES PATENT OFFICE,

LEVI W. STOOKWELL, OF RAVENNA, OHIO, ASSIGNOR TO STOOKWELL, BRAGG & (10., OF SAME PLACE.

IMPROVEMENT IN MACHINES "FOR MAKING METAL SCREWS.

Specification forming part of Letters Patent No. 200,155, dated February 12, 1878; application filed July13, 1877.

To all whom it may concern.-

Be it known that I, LEVI W. SrooKwELL, a resident of Ravenna, Portage county, Ohio, have invented a new and useful Improvement in Machines forMakingMachine Screws, which improvement is fully set forth in the following specification, reference being had to the accompanying drawings.

The object of my invention is to perform all the necessary operations to manufacture from metallic rods and finish machine screws, the rods being held in a series of viseshaving intermittent rotation on a common axis, and being operated on simultaneously by tools in a series of rotating tool-chucks.

Figure 1 is a vertical or plan view of the machine. Fig. 2 is an end elevation. Fig. 3 is a section of parts shown in Fig. 2. Fig. 4 is an end elevation. Figs. 5 and 6 are sections of parts shown in Fig. 4. Fig. 7 is a cross-section at the dotted line A in Fig. 1. Fig. 8 is a cross-section of parts shown in Fig. 7. Fig. 9 is a cross-section at the dotted line B in Fig. '1. Fig. 10 is a section of the tool-chuck D and its spindle. Fig. 11 is a section of chuck D at the dotted line 0 in Fig. 10. Fig. 12 is a face view of chuck D.

The frame H. is composed in part of three vertical circular plates, H H H parallel with each other, which support all the shafts and tool-chuck spindles. Through the cen ters of these circular plates is attached a hollow cylinder, I, which extends through the center of the rod-carrier L.

There is a series of eight tool-chucks, F F E E D D T T, arranged in a circle equally distant from each other. Their spindles 2 3 4 5 6 7 8 9 rotate in the circular parts of the frame near the circumference. In radial dovetail grooves on the inner side of the circular rod-carrier L is a series of vise's (only one of which, (Z (1 is shown in Fig. 1) surrounding the hollow spindle I, and so placed that when the rod-carrier is turned on the cylinder I to its proper position eight of the vises will be in line with the spindles of the tool-chucks.

There is a hole, b through the rod-carrier at each vise, and in line with the axes of the chuck-spindles, through which holes the rods to be operated on are inserted. The threading-chucks E E are moved forward and backward to thread the rods and withdraw from them by leading-screws a a firmly attached in the ends of the spindles, and turning in stationary threaded nuts 61 d in the frame.

The power is applied through crank b onmain shaft 1, which is connected by its wheel f, Fig. 9, with wheel f which turns loose on cylinder I. Wheel f connects with and rotates wheclsf f f g g g and spindles 2 3 6 7 8 9 constantly in the same direction, the wheels being on sleeves I), feathered to the spindles. The spindles 4 5, which hold the threadingdies, are rotated to thread the rods. by wheel h, which is attached to and turns with wheel f Wheel h connects with wheels 9 g h, the latter wheel being loose on sleeve 13 and connected with clutch i, which slides on a feather on sleeve '5 Thesleeve connects by a feather with spindle 5, so as to rotate the spindle and permit it to slide in the sleeve. Wheel h? on sleeve i rotates spindle 4 by means of the connecting-wheels h 703, the latter wheelbeing on sleeve 2', whichis connected by a feather with spindle 4.

The wheels k a, sleeve 6*, and clutch n on spindle 4 are similar to wheels h h, sleeve'i and clutch i on spindle 5, Figs. 9 and 1. Wheels g g k rotate on pins in the frame.

While spindles 4 5 are advancing and the dies are threading the rods, wheel h is in clutch, and wheel a out of clutch and turning loose on sleeve i To reverse the motion of the-threading-dies and withdraw them from the rods, clutch i is disconnected from wheel h, and clutch a is connected with wheel a, and then wheel h turns loose on sleeve 45, and the motion of spindles 4 5 is reversed by wheel a and wheel of, Figs. 1 and 9, on spindle 3.

The clutches i n have annular grooves, and

are operated by arms 01 d, which enter the clutchgrooves, and are attached to sliding rods d d in the frame. These rods are pivoted to swivel d, Figs. 1 and 2, so that by sliding one of the rods the other slides in the opposite direction. I

The rods 01 d are operated by levers e 0 One end of lever e connects with a sliding collar, 705, on rod 01 and the other end is piv- 7 :its lower end extends between two pins, 8 s,

I Figs. 1 and 7, in the side of cylinder I, and intermediate the two ends it is pivoted to a:

' turned in the frame by wheel'o Fig. '7, on the r i While the threading dies are operating on threaded nut, 5 on; the screw ohwhich is screw 0 and connected with wheel a on spindle 4.

the rods, the rotation of screw 0 moves nut '8 and lever 0 until itslower end is arrested by pin s, and the upper end, by compression of r thespiral' springf against collar f on rodd V forces spring f, attached tothe frame, out of a notch or depression in rod 61 and then'the 1 action of spring slides redid, and connects clutch n with wheel' a, while swivel. d" slides rod d", so as to disconnect clutch i from; wheel 1 h. This reverses the motion of threadingchucks E E, and withdraws them i from the threaded rods... The length of the threads tor be cut onthe rods is determined byadjust ing collar f' on rod. 11 While the thread ing-dies are thus withdrawing from therods,

'the wheel a on spindle 4, Figs? and 1, re:-

7 V reverses the motion of screw'o nuts and lever O 'hlll pin s arrests the lower :end'of E lever a; and; its upper'endpresscs against collar f on rod 1 and slides the me, enough. to disi connect clutch a from, wheel a without con 'necting clutch i with wheel ih. 1 Both wheels,

h and a nowturn loose, and the threading- V chucks E E cease to rotate.

' Art the same time that thechuoks E E advance to thread the rods, the chucks D D are more rapidly advanced to the proper position to shape the heads of other screws already threaded, and cut them off from the rods.

The bar (1, Fig. 1, connects the outer ends of screws (0* a the inner ends of which are in sorted in the ends of spindles 6 7 A pin through the side of each spindle 6 7 Fig. 10, enters an annular groove in each screw a a and holds it in the rotating spindle. The screws to a do not rotate. The bar al is connected with the slotted cam 1%, Fig. 1, by a pin, so that by turning the cam to the left chucks D D are moved toward carrier L.

In Fig. 1 all the parts of the machine are in position for all the tool-chucks to advance simultaneously toward carrier L to operate on the rods.

The circular cam R, Figs. 1 and 2, is attached to one side of wheel 1?, a segment of which is toothed, having a slip-tooth at each end of the segment. It turns loose on the hub of wheel 0, Fig. 3, which is attached to shaft (1 Wheel P and cam R are turned to the left to move forward chucks D D by wheel 0 on the same shaft with wheel 0, which is connected by wheels 02 0 Fig. 7, with wheel a on spindle 4. When wheel I has been thus turned, the whole of its toothed segment is to the left of wheel 0 which continues to rotate against the slip-tooth at the end of the segment.

The construction of chucks D D andconnecting parts is shown in Figs. 10, 11, and 12. W'hen chuck D. advances, the follower c7, which slidesin the bush 0 in the hollow end of spindle:7,is forced back by the end of the threaded rod in carrier Lragainstthe sp'iral spring 0? until the tools in. the chuck are in eel-1011a shapetheheadof the screw and sever it from the rod. 7

The head-shaping tool is held in tool-holder c and the cut-off tool in tool-holderci, which 7 slide in halt dovetail parallel grooves nearly. V

iacrossthe face of the chuck on opposite sides of the'spi'ndle. :The holders 0? c? are retained V V V i in their grooves by gibs 0 c. Thetools are held in opposits ends of the holders, so as to point toward each other, and. in the other I V V V 7 ends are pins, which enterconvergent grooves-5 L in 'cams'c e. 7 Apart i f'the groove atthe V 1 outer end of each cis parallel with the axis of r r 1 spindle :7 V The cams cl 0 movein slots through opplc'sitesides of chuck D, at right angles to p the tool-holders- Bydrawingback cams t le? f %the tools are'fed on the rod tillv the pin in holderct, which carries the: shaping-tool, en?

tersthe parallel part of the groove in came I Z whenthe head of. the screw is sufficiently Q if :chamfered, andtheshaping-tool ceasesto feed, 7 i I while the othertool continues to cutoff the p finished screiw. To each cam c 0 isattached :a rod, ,7 fhwhichslides in a groove length.- 7, V V wise of spindle 7 and the other ends of rods I fif are. connected bypins with collar 0 This collar is loose in anannular groove onthe hub of wheel which is threaded, and turns in the thread of screw (0 The tools in chucks D D are fed by rotating the toothed wheels 0 0 having a female screw, on the screws (0* a Fig. 7.

Wheel n on the threadingspindle 4 is connected by wheels 0 n 00 with wheel 0. Wheel 00 on the shaft of wheel 0 rotates wheels 0 0 which, as they move on the thread of screws a a slide wheel as on its feathered shaft by means of flanges projecting from wheel 00 on each side of wheels 0 c When spindle 4 reverses its motion to withdraw the threadin g-dies, the motion of wheels 0 c is reversed, which slides cams c 0 toward carrier L, and thereby withdraws the tools in chucks D D from the severed screws, and permits the force of springs a c to eject the finished screws from spindles 6 and 7.

The reversal of the motion of spindle 4 also reverses the motion of wheel 0 Figs. 1 and 2, and turns wheel P to the right, and cam R withdraws chucks D. D from the carrier L before the tools in the chucks are withdrawn far enough to permit the finished screw to be ejected from spindles 6 7 by springs 0 0 The inner end of follower c is flanged, which prevents it, by contact with the inner end of bush 0*, from being ejected from the spindle with the screw.

The milling-tools in chucks T T- partially mill the rods, and the tools i t in chucks F F finish the milling, and tool i, which is held in an opening in the side of each chuck F F,

points the rod. to feed their tools by screws to a a a Fig. 1. The screws are inserted in their spindles 2 3 8 9 in the same manner as screws a a in spindles 6 and 7. c

The tools are fed by turning screws to a a ain threaded nuts (I d d d. The screws are rotated by wheels 0 o 0 07, Fig. 7, which are feathered on the screws. These wheels are rotated to feed the tools by wheels n n a n 0 p p 10 and by wheel p on main shaft 1, wheel a, Fig. 8, being connected with clutch 0 which is feathered on shaft 1).

To withdraw the milling-chucks from the rods, clutch o is disconnected from. wheel n and connected with wheel a, whichis rotated by wheels p 10. Wheels 12 n on shaft 19 rotate in opposite directions, and when both of them are disconnected from the clutch they turn loose on their shaft, and cease to move the gears which move the millin g-chucks.

Clutch o is operated by lever 19, the inner end ofwhich is connected by pins with an annular groove in the clutch, and its outer end pivoted to the sliding collar 09 on shaft '0, Intermediate the ends it is pivoted to a loose collar, 85, Fig. 1, on the unthreaded part of screw 8", and between the adjustable collars x m. Screw s is turned in a female thread in the frame by wheel 8 which is feathered to the screw and rotated by wheel 0.

While the milling-chucks approach carrier L, the turning of screw 8 causes collar 00 to move the outer end of lever 0 so as to compress spring i without disconnecting clutch 0 from wheel u until the compression of spring 47 is sufiicient to cause the cam-pin c, Fig.v 8, on the bottom of lever e to force down and pass over the apex of spring 2;, the other end of .the spring being attached to cylinder I. The force of spring '5 against lever c' -then moves clutch 0 toward wheel n but the end of stop 0, entering the groove in a scroll on the side of :wheel a", arrests the clutch until, by the rotation .of wheel a" with its scroll, the endof stop 0 is carried out of the scroll and passes above wheel n which is thenconnected \lvith clutch 0?, as shown by dotted lines in ig. 8. l

The time of the disconnection of clutch 0 from wheels a n is determined by adjusting collar 00, Fig. 1, onscrew s so that the pointing and milling tools in chucks F F T T .will begin to point the rods just before the disconnectionof the clutch and wheels. During the disconnection screw 8 ceases to rotate, and chucks FF T T have no movement except rotation, and the pointing-tools finish the pointing of the rods and the milling-tools finish the milling by rotating in a plane at right angles to the rods. t

The connection of clutch o with wheel 12 rotates screw s in a direction opposite toits rotation when the connection was with wheel a and while the milling-chucks are withdrawing collar 00 forces the outer end of lever o against the spiral spring i compressing it These chucks are advanced against collar '0 till the lower end of lever 11 is forced back over the apex of spring 11 Fig. 8, and clutch 0 is again connected with wheel u At the same time the sliding collar 8 moves lever e by contact with finger 8 Fig. 1, on lever 6 compressing spring s against the adjustable collar 8 so as to slide back rod al and connect .clutch i with wheel h. The threading-chucks E E now begin to rotate and move toward carrier L, the threaded wheels 0 o 0 0", Fig. 7, begin again to move the tools in each of the chucks D D toward each other, and the milling-chucks F F T T again advance toward carrier L.

Having described the mode of operations of the tool-chucks until all of them have been withdrawn from the rods, I will now describe the construction and operation of parts connected with carrier L. 7

Wheel P, Fig. 2, and wheel 0, against its inner side, have the same diameter and a common center of motion. Wheel e-has a toothed segment with a slip-tooth at each .end, and is turned by wheel 0 It is attached to shaft d which turns in and exteri'tls through and be.- yond the. hollow cylinder I and carrier L. When wheel P and cam R are turned to the right to withdraw chucks D D, wheel 0 and shaft d are turned with them until pawl I), Fig. 4, on the arm I), attached to the other end of shaft (1 has moved back on ratchet b a little more than one-sixth of a revolution to the position shown by the dotted lines in Fig. 4.

. Ratchet b has six notches on its circumference, equally distant from each other, for pawl b to enter. It is attached to carrier L, which carries double as many vises as there are notches in ratchet b i The carrier and ratchet are retained on cylinder I by collars h" h There are six holes, 7L8, through carrier L, equally distant from each other, into which stop h is alternately forced by its spring 0 to firmly hold the carrier in place while the tools are operating on the rods. Stop h" slides in holes through guide H bolted to the frame. The lower part of pin 6, through stop h", extends into a slot in guide H and keeps stop it from turning. The part of the pin above the stop diverges from car.- rier L, so that by pressing down arm A against the side of the pin, stop h is forced out of hole M, leaving carrier L free to be turned by a forward movement of pawl D The rock-shaft A", extending the whole len gthof the machine, turns in frame H. Arms'A A Figs. 4. and 2, are attached to the rock-shaft near its ends, so that by pressing down arm A stop k is forced out of carrier L.

The toothed segment of wheel 0, Fig. 2, is of the requisite len gth to turn carrierL through the space of two tool-chucks, and when wheel eis turned alternately in opposite directions by wheel 0 it is arrested by contact of one of I the pins 8 e in its circumference with pin 0 in the frame H. The pin 3 is a spring, and

when wheel e is turning to the right to carry pawl 11 over ratchet b the spring-pin s is pressed outward by the wedgeshaped side of arm A without moving the arm, and stops at the position shown by dotted lines in Fig. 2, at the left of the arm. After chucks D D have been'withdrawn and the finished screws have been ejected from them, the millingchucks continue to operate for some time before they also are withdrawn from the rods, and in the meantime the operator of the machine releases the rods held in the two Vises opposite chucks D D (only one of which is shown in Fig. 1) by turning the vise'screws I), Fig. 4, and moves the rods the proper distance for the length of the screw-bolt to be made, and closes the vise-jaws d? d to hold them. When all the chucks have been withdrawn the connection of clutch t with wheel 71-, Fig. 1, causes wheel 0 to connect with the slip-teeth at the left-hand ends of the segments of wheels P and e and turn the'wheels to the left. In so turning, the spring-pin .9 coming in contact with arm A presses it down to the position shown by dotted lines in Fig. 2, thereby forcing down arm A against the side of pin 6 to the position shown by dotted lines in Figs. 4 and 6, and sliding stop h out of hole h in carrier L before pawl b moved by the turning of wheel 6, enters its notch in ratchet 11 The pawl then begins to turn carrier L, while spring-pin 8 Fig. 2, is passing over the end of arm A. When pin 8 has. passed arm A the arms A A are raised to their former position by the spiral spring a, Fig. on shaft A One end of spring .00 is connected with the frame H, and the other end is under arm A When the whole of the toothed segment of wheel 0, Fig. 2, has been turned to the left hand of wheel 03, pin 8 is again in contact with pin a", and stop 7L9, Fig. 4, by the force of spring 6 enters one of holes lbs, to hold the carrier L firmly in position for the chucks to operate on the rods, which all the chucks, except chucks D D, have been approaching since wheel 6 began turning.

In making connection between wheel 0 and the segments of wheels '1? and e, if the ends of the teeth come in contact with each other, the shaft of wheel 0 rises and compresses the spiral spring 0 Fig. 2, which forces wheel 0 back to position when the ends of the teeth have ceased to be in contact.

All parts of the machine are now in the position shown in Fig. 1, and wheel P, with its cam It, continues turning to the left to move chucks D D toward carrier L. The part of cam R with which bar at connects while wheels 6 and P are turning together to the left is at right angles to the axes of the chucks, so that chucks D D are not moved toward carrier L until it has been turned so as to bring the rods which have just been threaded in chucks E E, in line with the axes of chucks D D.

I claim as my invention-- 1. In a screw-cutting machine, a revolving series of non-rotating rod-holders, in combination with a series of rotating tools, adapted to operate simultaneously and successively on the rods to perform the operations of milling the rods, threading the screws, and severing the screws from the rods, the series of rodholders being adapted to carry rods, which may be fed forward at each revolution of the series for the formation of screws, substantially as described.

2. The carrier L, in combination with stop h", spring at, arms A A spring-pin s and wheel 6, having a toothed segment, substantially as described.

3. The wheel P, having a toothed segment, and'cam R, in combination with the bar (1, rods (0* a spindles 6 7 and chucks D D, substantially as described.

4. The wheels P and 0, each h( ving a toothed segment, in combination with wheel 0 shaft d carrier L, pawl b ratchet b and the cam R, bar d, rods 0& a spindles 6 7, and chucks D D, substantially as described.

5. The cams c 0 in combination with rods f f screw-wheel c and screw a substantially as described.

6. The lever e and screw '0 in combination with red at", collars f f, spring f clutch a, and pins 8 8 substantially as described.

7 The chuck E and wheel 02 in combination with wheel 0 screw 0 lever 0 rod 01 and clutch a, substantially as described.

8. The clutch 0 in combination with stop 0 and the scrollwheel or, substantially as described.

9. The chuck F and screw 8 in combination with wheels 0 n clutch 0", stop 0, wheel a, and scroll-wheel a", substantially as described.

10. The chuck F, spindle 2, rod (0, wheels 0 s screw .9 collar .9, lever 0 collar If, spring 8, rod d clutch 6 wheel h, spindle 5, and chuck E, substantially as described.

11. The clutch 0 for withdrawing chucks F F, in combination with lever '0 screw 8 collar 00 lever 0, rod 01 and clutch 1', substantially as described.

12. The combination of chuck F, spindle 3, sleeve b and wheel n with wheel n clutch n, sleeve i spindle 4, and chuck E, substantially as described.

13. The cam R, a part of it being parallel with its line of motion, in combination with bar d, rod 0?, spindle 7, chuck D, and with the toothed segment-wheel P, wheel 0 toothed segment-wheel e, shaft (1 ratchet b pawl b and carrier L, substantially as described.

LEVI W. STOGKWELL.

Witnesses Gno. F. ROBINSON, BRADFORD HOWLAND. 

